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Old 04-27-2009, 02:52 PM   #48 (permalink)
wstar
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Join Date: Mar 2009
Location: Houston, TX
Posts: 4,024
Drives: too slow
Rep Power: 3594
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Here's some raw data on our 6MT vs 7AT gear ratios based on the service manual and simple multiplication:


6MT:
Rear Diff 3.692
1st 3.794
2nd 2.324
3rd 1.624
4th 1.271
5th 1.000
6th 0.794
Rev 3.446

7AT:
Rear Diff 3.357
1st 4.924
2nd 3.194
3rd 2.043
4th 1.412
5th 1.000
6th 0.862
7th 0.772
Rev 3.972

Total gearing, 6MT:
1st 14.007448
2nd 8.580208
3rd 5.995808
4th 4.692532
5th 3.692000
6th 2.931448
Rev 12.722632

Total gearing, 7AT:
1st 16.529868
2nd 10.722258
3rd 6.858351
4th 4.740084
5th 3.357000
6th 2.893734
7th 2.591604
Rev 13.334004

The 7AT has a wider overall range (lower first gear, higher final gear), but with an extra gear the "closeness" doesn't look too bad, although I didn't run those numbers.

Also, another thing to keep in mind in discussing this, is that the 7AT so far has seemed to have more driveline power loss on the dyno, which is to be expected.
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